Electronic Brake Distribution

Upon entry into EBD inlet valve for rear brake circuit is switched on so that fluid supply from master cylinder is shut off. In order to decrease rear brake pressure, outlet valve for rear brake circuit is pulsed. This allows fluid to enter low pressure accumulator (LPA) in hydraulic control unit (HCU) resulting in a drop in fluid pressure to rear brakes. In order to increase rear brake pressure, outlet valve is switched off and inlet valve is pulsed. This increases pressure to rear brakes. This back-and-forth process will continue until required slip difference is obtained. At end of EBD braking (brakes released) fluid in LPA drains back to master cylinder by switching on outlet valve and draining through inlet valve check valve. At same time inlet valve is switched on in case of another brake application.

The EBD will remain functional during many ABS fault modes. If both red BRAKE, and amber ABS warning indicators are illuminated, EBD may not be functioning.